British Prime Minister Boris Johnson has said Sacoolas was wrong to use diplomatic immunity to leave Britain and has urged U.S. President Donald Trump to reconsider the U.S. position.

Harry Dunn, 19, was fatally struck while on his motorcycle in a road collision with Anne Sacoolas, the wife of American official Jonathan Sacoolas outside of a British air force base.

The 19-year-old Dunn was killed in August when his motorcycle collided with a car allegedly driven by Sacoolas outside a British air force base in southern England used by the U.S. military.